I used righteye flounder this time but you can also use halibut, sea bream, or lefteye flounder.,______,Put the soy sauce, sake, mirin, and if you like a sweeter flavor, add the brown sugar into the frying pan.,When it begins to boil, place the fish and ginger in the pan and let it simmer over medium heat.,Place a sheet of parchment paper or aluminum foil on top as a lid and leave covered for 10-15 minutes as it simmers.,When some of the liquid has evaporated off, thickening the simmering sauce into a syrup-like consistency, coat it over the fish and you're done.